<script lang="ts">
export default {
   name:'GoodsImage'
  }
</script>
<script lang="ts" setup>
import { ref } from 'vue'
import { computed } from 'vue'
import { useMouseInElement } from '@vueuse/core'
defineProps<{
  images: string[]
}>()
const active = ref(0)
const target = ref(null)
//得到中图对象
const { isOutside, elementX, elementY } = useMouseInElement(target)
//定义一个计算属性,用来得到遮罩层的位置
const position = computed(() => {
  let x = elementX.value - 100
  let y = elementY.value - 100
  //限制 x y 的值: 0 < x < 200 0 < y < 200
  if ( x <= 0) x = 0
  if ( x >= 200) x = 200
  if ( y <= 0) y = 0
  if ( y >= 200) y = 200
  return {
    x,y
  }
})
</script>
<template>
 <div class="goods-image">
    <!-- 大图 -->
    <div v-show="!isOutside" class="large" :style="[{ backgroundImage: `url(${images[active]})`,
    backgroundPosition: `-${position.x * 2}px -${position.y * 2}px`
     }]"></div>
    <!-- 中图 -->
    <div class="middle" ref="target">
      <img :src="images[active]" alt="" />
      <div v-show="!isOutside" :style="{ left: `${ position.x}px`,top: `${position.y}px` }" class="layer"></div>
    </div>
    <!-- 小图 -->
    <ul class="small">
      <li @mouseenter="active = index" v-for="(item, index) in images" :key="item"
        :class="{ active: index === active }">
        <img :src="item" alt="" />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
 .large {
   position: absolute;
   top: 0;
   left: 412px;
   width: 400px;
   height: 400px;
   box-shadow: 0 0 10px rgba(0,0,0,0.1);
   background-repeat: no-repeat;
   background-size: 800px 800px;
   background-color: #f8f8f8;
   }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
   cursor: move;
   .layer {
     width: 200px;
     height: 200px;
     background: rgba(0,0,0,.2);
     left: 0;
     top: 0;
     position: absolute;
   }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>
